Maximum Subarray in Euphoria

Published on 28 February 2023 (Updated: 28 February 2023)

Welcome to the Maximum Subarray in Euphoria page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

``````include std/io.e
include std/types.e
include std/text.e
include std/get.e as stdget
include std/sequence.e
include std/math.e
include std/mathcons.e

-- Indices for value() return value

-- Indices for parse_int() return value
enum PARSE_INT_VALID, PARSE_INT_VALUE

function parse_int(sequence s)
-- Trim off whitespace and parse string
s = trim(s)

-- Error if any errors, value is not an integer, or any leftover characters
boolean valid = (
result[VALUE_ERROR_CODE] = GET_SUCCESS
and integer(result[VALUE_VALUE])
)

-- Get value if invalid
integer value = 0
if valid
then
value = result[VALUE_VALUE]
end if

return {valid, value}
end function

-- Indices for parse_int_list() return value
enum PARSE_INT_LIST_VALID, PARSE_INT_LIST_VALUES

function parse_int_list(sequence s)
-- Split string on comma
sequence list = split(s, ",")

-- Parse each item
integer valid = FALSE
sequence values = {}
for n = 1 to length(list)
do
sequence result = parse_int(list[n])
valid = result[PARSE_INT_VALID]
values &= result[PARSE_INT_VALUE]
if not valid
then
exit
end if
end for

return {valid, values}
end function

procedure usage()
puts(STDOUT, "Usage: Please provide a list of integers in the format: \"1, 2, 3, 4, 5\"\n")
abort(0)
end procedure

-- Find maximum subarray using Kadane's algorithm.
function maximum_subarray(sequence values)
atom best_sum = MINF
integer current_sum = 0
for k = 1 to length(values)
do
current_sum = values[k] + max({0, current_sum})
best_sum = max({best_sum, current_sum})
end for

return best_sum
end function

-- Check 1st command-line argument
sequence argv = command_line()
if length(argv) < 4 or length(argv[4]) = 0
then
usage()
end if

-- Parse 1st command-line argument
sequence result = parse_int_list(argv[4])
sequence values = result[PARSE_INT_LIST_VALUES]
if not result[PARSE_INT_LIST_VALID]
then
usage()
end if

-- Calculate maximum subarray and display
integer max_value = maximum_subarray(values)
printf(STDOUT, "%d\n", max_value)

``````

Maximum Subarray in Euphoria was written by:

• rzuckerm

If you see anything you'd like to change or update, please consider contributing.

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